Answer
$4$
Work Step by Step
Recall:
$\begin{vmatrix}
a&b\\
c&d\\
\end{vmatrix}= ad - bc$
Thus,
$\begin{vmatrix}
6&5\\
-2& -1\\
\end{vmatrix}= (6\times(-1))-(-2\times5)=-6-(-10)= 4$
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